This undated handout photo provided by the Arlington County, Va. Police Department shows Jorge Torrez. Prosecutors have urged a federal jury to impose the death penalty on an ex-Marine who murdered a Navy sailor, saying it's the only adequate punishment for a man who has committed a series of sexually motivated attacks. The jury heard closing arguments Thursday in federal court in Alexandria in the trial of 25-year-old Jorge Torrez. (AP Photo/Arlington County, Va. Police Department)

ALEXANDRIA, Va. (AP) — A federal jury sentenced an ex-Marine to death on Thursday for murdering a fellow service member in 2009, one among a series of violent, sexually motivated attacks he committed over the years.

Jorge Torrez of Zion, Ill., is the first person since 2007 to be sentenced to death at the federal courthouse in Alexandria.

After Torrez, 25, was found guilty earlier this month of Navy Petty Officer Amanda Snell’s murder, Torrez ordered his lawyers not to put on any defense or question the government’s case during the trial’s sentencing phase.

Prosecutors said Torrez not only killed Snell but also murdered two young girls in his hometown of Zion when he was 16.

On Thursday, Torrez sat impassively in front of the jury in his green jail jumpsuit, forgoing the civilian clothes he has worn all trial.

The jury found Torrez guilty of the murder of Petty Officer Amanda Snell, a Las Vegas native, in 2009 at Joint Base Myer-Henderson Hall in Arlington, in a barracks where both lived a few doors down from each other.

But prosecutor James Trump reminded the jury that the murder of Snell was far from his only crime. When Torrez was only 16, prosecutors say he stabbed and killed two girls, 8-year-old Laura Hobbs and 9-Year-old Krystal Tobias, in a park in his hometown of Zion. The crime was especially brutal — jurors saw gruesome photos of Hobbs’ body with stab wounds to the eyes that medical experts concluded occurred while she was still alive. Semen found on Hobbs was linked by DNA evidence to Torrez.

And in 2010, Torrez committed a series of stalking attacks on three women in northern Virginia, including one who was raped, choked and left for dead. It was Torrez’s arrest in those cases that helped investigators tie him to Snell’s murder and the slayings of the two Illinois girls. He is already serving a life sentence for the Arlington attacks.

Until his arrest in Virginia, Trump told jurors, Torrez believed he had literally gotten away with murder.

But Torrez bragged about the killings to another inmate after his arrest in the Arlington attacks, and prosecutors played recordings of those confessions to the jury in which he laughed about the killings and showed no remorse.

Trump reminded jurors that Torrez bragged about being “an army of one” while preying on defenseless children.